Hermaeus Mora

Hermaeus Mora is an ancient Atmoran demon who nearly seduced the Nords into becoming Aldmer. Most of the myths about Ysgramor are about escaping the wiles of Hermaeus Mora. Hermaeus Mora is also called the Demon of Knowledge. He is related to the cult origins of the Morag Tong. Mephala is his sister.

Discerning the Transmundane

During the Main Quest: Elder Knowledge, you are sent to the College of Winterhold in search of an Elder Scroll. Speak to Faralda about gaining admittance.

Otherwise, you must locate Septimus Signus's Outpost on your own. Skip to the section marked Puppet of the Abyss instead

Acute Occult Ruminations

Enter the College and head into the Arcanaeum. Look for the Orc Mage named Urag gro-Shub, who runs this location. You may ask him if there is anything you can do for the college (which allows you to accomplish several college related tasks unrelated to this quest) and ask about the library, you're here to talk about the Elder Scroll. He laughs if you ask him if there's an Elder Scroll that you may use and states that he would not show it to you even if he had obtained one. Ask if he has at least any information upon them.